The alpha4/beta7 integrin is a receptor for MadCAM, fibronectin and VCAM-1. This integrin is only found leukocytes which are directed to the Peyer's Patches of the gut. MadCAM which is an addressin, is only found on Peyer's Patch Endothelium. The alpha4/beta7 integrin is also known as (LPAM-1). Data show that protein synthesis-dependent upregulation of the functional beta7 integrin occurs under conditions when beta4 and beta1 integrins are fully expressed, indicating a sequential appearance of specific adhesion molecules on differentiating eosinophil progenitors. See: Allergy 2000 Sep;55(9):865-72